Adjustable bed frame



FIG. 1 is a front and right side perspective view of an adjustable bed frame showing my new design; and

FIG. 2 is a view similar to FIG. 1 showing the frame in an upright position.

For convenience of illustration, the slightly bent reinforcement of the frame, shown in FIG. 1 below the slats at the front of the middle portion thereof, is omitted in FIG. 2. 

The ornamental design for an adjustable bed frame, as shown and described. 